Mini Milspec AR15 Buffer Tube Kit with Micro M4 Stock- Carbine

$69.95 - $79.95
(2 reviews)
Current Stock:
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For those wanting to make their AR15 as compact as possible. Our Mini Milspec System (based on our Original AR15 CQC system) provides you with a compact buffer system while not affecting reliability while still being able to utilize a Milspec BCG. The M4 stock is taken down from just over 6.5" to 5", Mini Buffer Tube is only 5.25" in length from end of the receiver when installed. The Mini Milspec M4 Stock can collapse completely flush in the last adjustment hole on the buffer tube making the front of the stock flush with the castle nut.

Mini Milspec Buffer Tube with Mini M4 Stock Installed, collapsed configuration- 5 5/8” from back of receiver

Normal Milspec M4 stock with 6 position buffer tube- 7 1/8”

Magpul SL-M will collapse flush with castle nut in 2nd adjustment slot, .5" longer than KAK Mini M4 Stock

The Mini Milspec Buffer System is compatible with 556/223,300 BLK, 762x39, and similar rifle calibers. The weight of these mini buffers and spring rate of the buffer spring mirror the functionality of a traditional carbine buffer weight/ H Buffer weight. Unlike most short buffer tube setups, ours is designed to function with any compatible Milspec bolt carrier group. 

  • Compatible with 5.56/223, 7.62x39, 300 Blackout, and Similar 
  • Proprietary Mini 5 Position Buffer Tube extends only 5.25" from the rear of the receiver. Buffer will accept Milspec parts and stocks.
  • MiniMilspec Buffer Tube- Hard coat anodized 7075 Impact Extrusion
  • Flatwire buffer spring for increased reliability and longer life
  • Proprietary mini buffer weighs only 2.5oz- Carbine/ 3.3oz- Heavy and performs like a standard carbine buffer in combination with our flatwire buffer spring
  • Mil-spec end plate
  • Mil-spec castle nut


NOTE- These M4 stocks have been "chopped" finish on the shortened portion where stock accepts buffer tube may have blemishes that can be sanded off if desired, this is reflected in the cost.


  • 5
    Works with law folder

    Posted by Steven Valdes on December 31, 2023

    So far so good, using the heavy buffer on a 13.7 Ballisticadvantage upper

  • 4
    Premature reviewing affects a lot of guys

    Posted by Dex on December 18, 2023

    I haven’t shot with it, but I slapped it on a lower. Install is exactly the same as regular tubes and quality is as good as expected from KAK. The cut down M4 stock is well crafted. Much better job than the pistol brace I cut down to fit this. The spring is stout, as expected, so Kak kindly included a tool to assist with insertion, which I didn’t realize til after I jammed it in there dry.